# CVE-2025-66467: Apache CloudStack incomplete cleanup in MinIO bucket deletion

Source: https://junglewise.ai/threats/cve-2025-66467-apache-cloudstack-incomplete-cleanup-in-minio-bucket-deletion  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-08. Updated: 2026-05-11  
License: CC BY 4.0 with a link back

CVE-2025-66467 · Severity: high · CVSS 8 · Published 2026-05-08

Apache CloudStack, an open-source platform for managing cloud computing environments, contains a flaw in how it handles MinIO storage buckets. When a user deletes a storage bucket, the system fails to properly clear the associated access policies. This allows a former owner to use their old credentials to gain unauthorized read and write access if a new bucket is later created with the same name by a different user.

## Quick answers

**Is CVE-2025-66467 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-66467 being exploited in the wild.

**How severe is CVE-2025-66467?** High severity, with a CVSS score of 8, published 8 May 2026.

**Which products and versions are affected?** Apache CloudStack 4.19.0.0 through 4.20.2.0, 4.21.0.0 through 4.22.0.0.

**Is there a fix for CVE-2025-66467?** A patch was published on 2026-05-08. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2025-66467 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2025-66467?** Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A vulnerability classified as Incomplete Cleanup (CWE-459) exists in Apache CloudStack's integration with MinIO storage. When a bucket is deleted via CloudStack, the underlying MinIO access policies are not removed. If a subsequent user creates a bucket with an identical name, the original owner's access and secret keys remain valid for the new resource. An attacker with prior ownership of a bucket name can thus achieve unauthorized data exfiltration or modification. The issue is resolved in Apache CloudStack versions 4.20.3.0 and 4.22.0.1.

## Affected products

- Apache CloudStack 4.19.0.0 through 4.20.2.0, 4.21.0.0 through 4.22.0.0

## Timeline

- 2026-05-08: disclosed
- 2026-05-08: advisory
- 2026-05-08: patched

## References

- [https://lists.apache.org/thread/n8mt5b7wkpysstb8w7rr9f02kc5cq2xm](https://lists.apache.org/thread/n8mt5b7wkpysstb8w7rr9f02kc5cq2xm)
- [http://www.openwall.com/lists/oss-security/2026/05/09/4](http://www.openwall.com/lists/oss-security/2026/05/09/4)